Commit 2f02c5e4 authored by Robert Hancock's avatar Robert Hancock Committed by Stephen Boyd
Browse files

clk: si5341: Add silabs,iovdd-33 property 



Add a property to allow specifying that the external I2C IO pins are using
3.3V voltage thresholds rather than 1.8V.

Signed-off-by: default avatarRobert Hancock <robert.hancock@calian.com>
Link: https://lore.kernel.org/r/20210325192643.2190069-9-robert.hancock@calian.com


Signed-off-by: default avatarStephen Boyd <sboyd@kernel.org>
parent ab89a343

drivers/clk/clk-si5341.c

+9 −1
Original line number Diff line number Diff line
@@ -81,6 +81,7 @@ struct clk_si5341 { 
	u8 num_synth;

	u16 chip_id;

	bool xaxb_ext_clk;

	bool iovdd_33;

};

#define to_clk_si5341(_hw)	container_of(_hw, struct clk_si5341, hw)
@@ -103,6 +104,7 @@ struct clk_si5341_output_config { 
#define SI5341_IN_SEL		0x0021

#define SI5341_DEVICE_READY	0x00FE

#define SI5341_XAXB_CFG		0x090E

#define SI5341_IO_VDD_SEL	0x0943

#define SI5341_IN_EN		0x0949

#define SI5341_INX_TO_PFD_EN	0x094A
@@ -351,7 +353,6 @@ static const struct si5341_reg_default si5341_reg_defaults[] = { 
	{ 0x0804, 0x00 }, /* Not in datasheet */

	{ 0x090E, 0x02 }, /* XAXB_EXTCLK_EN=0 XAXB_PDNB=1 (use XTAL) */

	{ 0x091C, 0x04 }, /* ZDM_EN=4 (Normal mode) */

	{ 0x0943, 0x00 }, /* IO_VDD_SEL=0 (0=1v8, use 1=3v3) */

	{ 0x0949, 0x00 }, /* IN_EN (disable input clocks) */

	{ 0x094A, 0x00 }, /* INx_TO_PFD_EN (disabled) */

	{ 0x0A02, 0x00 }, /* Not in datasheet */
@@ -1160,6 +1161,11 @@ static int si5341_finalize_defaults(struct clk_si5341 *data) 
	int res;

	u32 revision;



	res = regmap_write(data->regmap, SI5341_IO_VDD_SEL,

			   data->iovdd_33 ? 1 : 0);

	if (res < 0)

		return res;



	res = regmap_read(data->regmap, SI5341_DEVICE_REV, &revision);

	if (res < 0)

		return res;
@@ -1544,6 +1550,8 @@ static int si5341_probe(struct i2c_client *client, 
	}

	data->xaxb_ext_clk = of_property_read_bool(client->dev.of_node,

						   "silabs,xaxb-ext-clk");

	data->iovdd_33 = of_property_read_bool(client->dev.of_node,

					       "silabs,iovdd-33");



	if (initialization_required) {

		/* Populate the regmap cache in preparation for "cache only" */